However, seeing the continuation of the important code, Wei Shuai's lingering sound is insufficient. -Gu Yanwu's "Twenty-four Rhymes of Li Zide"

This phrase can't be found in the ancient Chinese dictionary. Let's guess according to the meaning of the poem for the time being.

The "lingering sound" in the above two poems should refer to the same thing. We can see that "Zhou Yan" in the upper and lower sentences of the poem refers to the proverbs in Zhou Li, and "Yao Dian" refers to the articles describing Tang Yao's merits and demerits in Shangshu. It is inferred that "lingering sound" should be a proper noun, the word "Yu" refers to an ancient saint or surname, and "Yin" has an explanation.

As for the other poem given by LL, I can only guess and try to explain it according to the above meaning.

Thousands of miles of forest are frozen, and a little spring comes from the bottom. -Zhang Dodge's Twenty Plum Blossoms

This poem has no appreciation and no background, so we can only infer that it belongs to Yongmei from the title, and compare the previous sentences. The analysis is as follows:

Many forests were frozen, and the ink for writing ("lingering sound" refers to the written words) quickly solidified, indicating that the weather was already very cold at this time, but the vitality of plum blossoms ("spring" refers to plum blossoms) emerged from the bottom of the valley.

I hope I can help LL~